tv/ movies: Policeman must defuse bus which will blow if it goes below 50 miles per hour?

Questions

Because the natural habitat of ---------- is of little use to man - the alkaline African lake waters support few fish and cannot be used for human consumption or irrigation - and also because their resting areas are typically inaccessible, the birds are rarely disturbed, unlike other African wild birds.?

The American opossum, a marsupial, bears its young just 12 to 13 days after conception. The Asiatic elephant takes 608 days to give birth, or just over ----------?

Migrating geese fly in a V-formation to save energy. A goose's wings churn the air and leave an air current behind. In the flying wedge, each bird is in position to get a lift from the current left by the bird ahead. It is easier going for all, except the leader. During a migration, geese are apt to take turns in the ----------?

Garter snakes, though reptiles, do not ----------. They bear young, just as mammals do.?

Between the mid-1860's and 1883, the ---------- population in North America was reduced from an estimated 13 million to a few hundred.?